I love these sorts of questions!
Anyway, the Catholic Church long asserted that Anglican Holy Orders are invalid because of insufficiency with the consecration wording for almost a generation or two of Anglican Bishops.
Old Catholics, and potentially some Eastern and Oriental Orthodox are in communion with the Anglican Church. They all have valid Orders per the Roman Catholic Church.
Could a couple of those bishops, at the request of the Anglican Church, lead a huge consecration service to re-establish valid apostolic succession in the eyes of the RCC?